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Search for Ultra High-Energy Neutrinos with AMANDA-II
University of Kalmar, School of Pure and Applied Natural Sciences.
2008 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 675, no 2, 1014-1024 p.Article in journal (Refereed) Published
Abstract [en]

A search for diffuse neutrinos with energies in excess of 105 GeV is conducted with AMANDA-II data recordedbetween 2000 and 2002. Above 107 GeV, the Earth is essentially opaque to neutrinos. This fact, combined with thelimited overburden of the AMANDA-II detector (roughly 1.5 km), concentrates these ultraYhigh-energy neutrinos atthe horizon. The primary background for this analysis is bundles of downgoing, high-energymuons fromthe interactionof cosmic rays in the atmosphere. No statistically significant excess above the expected background is seen in the data,and an upper limit is set on the diffuse all-flavor neutrino flux of E290%CL < 2:7 ; 107 GeV cm2 s1 sr1 valid overthe energy range of 2 ; 105 to 109 GeV. A number of models that predict neutrino fluxes from active galactic nucleiare excluded at the 90% confidence level.

Place, publisher, year, edition, pages
2008. Vol. 675, no 2, 1014-1024 p.
National Category
Physical Sciences
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-7503OAI: oai:DiVA.org:lnu-7503DiVA: diva2:344523
Available from: 2010-08-19 Created: 2010-08-19 Last updated: 2011-06-13Bibliographically approved

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